US20240327091A1 - Container, method for manufacturing container, device for manufacturing container, seal bar, and film assembly - Google Patents

Container, method for manufacturing container, device for manufacturing container, seal bar, and film assembly Download PDF

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Publication number
US20240327091A1
US20240327091A1 US18/580,307 US202218580307A US2024327091A1 US 20240327091 A1 US20240327091 A1 US 20240327091A1 US 202218580307 A US202218580307 A US 202218580307A US 2024327091 A1 US2024327091 A1 US 2024327091A1
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United States
Prior art keywords
film
tearing strip
belt
shaped base
tab
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Pending
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US18/580,307
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English (en)
Inventor
Ryo Katada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Idemitsu Unitech Co Ltd
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Idemitsu Unitech Co Ltd
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Assigned to IDEMITSU UNITECH CO., LTD. reassignment IDEMITSU UNITECH CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATADA, RYO
Publication of US20240327091A1 publication Critical patent/US20240327091A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/66—Inserted or applied tearing-strings or like flexible elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5827—Tear-lines provided in a wall portion
    • B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
    • B65D75/5838—Tear-lines provided in a wall portion for tearing out a portion of the wall combined with separate fixed tearing means, e.g. tabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5827—Tear-lines provided in a wall portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/24—End- or aperture-closing arrangements or devices using self-locking integral or attached closure elements, e.g. flaps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
    • B65D33/2575—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor the slide fastener providing access to the bag through a bag wall, e.g. intended to be cut open by the consumer
    • B65D33/2583—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor the slide fastener providing access to the bag through a bag wall, e.g. intended to be cut open by the consumer the slide fastener being attached to one wall only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
    • B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
    • B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor

Definitions

  • the present invention relates to a container, a container manufacturing method, a container manufacturing device, a seal bar, and a film assembly.
  • Patent Literature 1 describes a container including: a film that includes a first area and a second area opposed to each other; an elongated tearing strip to be bonded to the first area; an elongated belt-shaped base disposed between the tearing strip and the second area; a tab defined by a cut that passes through the first area of the film and the tearing strip, and a surrounding seal area bonding the first area and the second area in an area surrounding the tab.
  • Patent Literature 1 In a container described in Patent Literature 1, it is possible to form an opening in a container body by breaking a belt-shaped base in a surrounding seal portion when a tearing strip is grasped and pulled at a tab, and thereafter separating the tearing strip from the belt-shaped base and pulling the tearing strip. However, it is necessary to pull the tearing strip with a relatively large force at a moment of breaking the belt-shaped base. There is thus still room for improvement in terms of smoothness in separating the tearing strip and the belt-shaped base from each other.
  • FIG. 1 is a plan view of a bag-shaped container according to a first exemplary embodiment of the invention.
  • FIG. 2 is a cross-sectional view taken along a line II-II of FIG. 1 .
  • FIG. 3 is a cross-sectional view taken along a line III-III of FIG. 1 .
  • FIG. 4 A illustrates a principle relating to the breaking of a belt-shaped base in an intersection with a bonding region.
  • FIG. 4 B illustrates the principle relating to the breaking of the belt-shaped base in the intersection with the bonding region.
  • FIG. 5 is an enlarged view of a surrounding seal portion of the bag-shaped container illustrated in FIG. 1 .
  • FIG. 6 illustrates a process of manufacturing the bag-shaped container according to the first exemplary embodiment of the invention.
  • FIG. 7 is an enlarged cross-sectional view of a portion of the manufacturing process illustrated in FIG. 6 .
  • FIG. 8 is a plan view of a bag-shaped container according to a second exemplary embodiment of the invention.
  • FIG. 9 is an enlarged view of a surrounding seal portion of the bag-shaped container illustrated in FIG. 8 .
  • FIG. 10 is a plan view of a bag-shaped container according to a third exemplary embodiment of the invention.
  • FIG. 11 is a cross-sectional view taken along a line XI-XI of the bag-shaped container illustrated in FIG. 10 .
  • FIG. 12 is a cross-sectional view of a bag-shaped container according to a fourth exemplary embodiment of the invention.
  • FIG. 13 is a plan view of a bag-shaped container according to a fifth exemplary embodiment of the invention.
  • FIG. 14 is a cross-sectional view taken along a line XIV-XIV of the bag-shaped container illustrated in FIG. 13 .
  • FIG. 15 illustrates an exemplary configuration of a film assembly according to the fifth exemplary embodiment of the invention.
  • FIG. 16 illustrates a process of manufacturing a bag-shaped container using the film assembly illustrated in FIG. 15 .
  • FIG. 1 is a plan view of a bag-shaped container according to a first exemplary embodiment of the invention.
  • FIG. 2 is a cross-sectional view taken along a line II-II of FIG. 1 .
  • FIG. 3 is a cross-sectional view taken along a line III-III of FIG. 1 .
  • a bag-shaped container 100 includes a film 110 , a tearing strip 120 , a belt-shaped base 130 , and a zipper portion 140 .
  • the film 110 is folded back on side portions 101 A and 101 B of the bag-shaped container 100 .
  • a top seal portion 102 are bonded to each other, opposed parts of a bottom seal portion 103 are bonded to each other, and opposed parts of a back seal portion 104 are bonded to each other.
  • the film 110 is thereby formed into a bag-shaped container body.
  • a method of forming the container body with use of the film 110 is not particularly limited.
  • the film 110 may be folded back on only one of the side portions, i.e., the side portion 101 A (or the side portion 101 B), of the bag-shaped container 100 , and a side seal portion may be provided on the other side portion.
  • the container body may be formed using two films by providing respective side seal portions on the side portions 101 A and 101 B.
  • the bag-shaped container may be provided in a state where the top seal portion 102 or the bottom seal portion 103 is not formed for a purpose of enclosing contents, and a top seal portion or a bottom seal portion may be formed afterward.
  • a container may be provided that includes a container body other than a bag-shaped container body.
  • the tearing strip 120 and the belt-shaped base 130 are elongated members that extend in the same direction as each other, and are interposed between two surfaces of the film 110 that are included in the container body.
  • the two surfaces are also referred to as a first film 111 and a second film 112 .
  • folding back a single film provides the first film 111 and the second film 112 in the illustrated example; however, the first film 111 and the second film 112 may be provided as multiple separate films in another example. As illustrated in the cross-sectional views of FIGS.
  • the first film 111 , the tearing strip 120 , the belt-shaped base 130 , and the second film 112 are stacked in this order in a part where the tearing strip 120 and the belt-shaped base 130 are interposed. It is to be noted that those members may be stacked with other members interposed therebetween. Further, the stacked members are not necessarily bonded to each other except in a surrounding seal portion 160 to be described later. Specifically, the tearing strip 120 is bonded to the first film 111 and the belt-shaped base 130 is bonded to the tearing strip 120 and the first film 111 , but the belt-shaped base 130 and the second film 112 are not bonded to each other except in the surrounding seal portion 160 .
  • the film 110 includes, for instance, a single-layered or multi-layered thermoplastic resin film.
  • a thermoplastic resin includes, for instance, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP).
  • PP polypropylene
  • HPP polypropylene homopolymer
  • RPP polypropylene random copolymer
  • BPP polypropylene block copolymer
  • OPET biaxially oriented polyethylene terephthalate
  • nylon biaxially oriented nylon
  • a resin included in the film 110 is not necessarily derived from a fossil fuel, and may be, for instance, an environmentally friendly bio-plastic or a mixture of the resin derived from the fossil fuel and the bio-plastic.
  • the bio-plastic are, for instance, bio-polyethylene and bio-polypropylene.
  • bio-based PET and bio-nylon are also available as the bio-plastic.
  • the film 110 may include a layer of a metal material such as aluminum, or a layer of an inorganic material.
  • the tearing strip 120 and the belt-shaped base 130 are each formed by extrusion molding of a resin composition containing, for instance, a polyolefin-based resin.
  • the polyolefin-based resin is exemplified by LDPE, LLDPE, or PP.
  • PP include HPP, RPP, and BPP.
  • a resin included in each of the tearing strip 120 and the belt-shaped base 130 is not necessarily derived from a fossil fuel, and may be, for instance, an environmentally friendly bio-plastic or a mixture of the resin derived from the fossil fuel and the bio-plastic.
  • Preferably usable as the bio-plastic are, for instance, bio-polyethylene and bio-polypropylene.
  • a known additive such as a stabilizer, an antioxidant, a lubricant, an antistatic agent, or a colorant may be added as necessary.
  • the tearing strip 120 undergoes interfacial peeling from the belt-shaped base 130 .
  • the tearing strip 120 and the belt-shaped base 130 include a combination of resins having low compatibility with each other.
  • the tearing strip 120 may include a polypropylene-based resin
  • the belt-shaped base 130 may include a low-density polyethylene-based resin.
  • the combination of resins having low compatibility with each other including resins other than the polyolefin-based resin is exemplified by the following, in the form of the first resin/the second resin: LDPE/RPP, LLDPE/RPP, LDPE/HPP, LLDPE/HPP, LDPE/polystyrene (PS), LLDPE/PS, RPP/PS, HPP/PS, LDPE/polyethylene terephthalate (PET), LLDPE/PET, RPP/PET, HPP/PET, PS/PET, LDPE/nylon (Ny), LLDPE/Ny, RPP/Ny, HPP/Ny, and PS/Ny.
  • LLDPE may at least partially be metallocene-based linear low-density polyethylene.
  • the tearing strip 120 and the belt-shaped base 130 may include the bio-plastic, or the mixture of the resin derived from the fossil fuel and the bio-plastic.
  • the bio-plastic are bio-polyethylene and bio-polypropylene.
  • available as the bio-plastic are, for instance, bio-based PET, bio-polystyrene, and bio-nylon.
  • the zipper portion 140 includes a first base 141 provided continuously with the belt-shaped base 130 , a second base 142 opposed to the first base 141 and bonded to the first film 111 , and engagement portions 143 A and 143 B that respectively protrude from the first base 141 and the second base 142 and are engageable with each other.
  • Materials of the zipper portion 140 are, for instance, similar to those of the belt-shaped base 130 described above.
  • the shapes of the engagement portions 143 A and 143 B are not limited to the illustrated male and female shapes, and it is possible to employ various shapes of engagement portions of known zippers having a combination of, for instance, a claw shape, a hook shape, and a knob shape.
  • the engagement portion 143 A has a female shape and the engagement portion 143 B has a female shape; however, they may be the other way around. Further, the engagement portions may not be one pair. For instance, one or more pairs of additional engagement portions may be provided, such as hooks 144 A and 144 B illustrated in an imaginary line.
  • a resin included in the zipper portion 140 is not necessarily derived from a fossil fuel, and may be, for instance, an environmentally friendly bio-plastic or a mixture of the resin derived from the fossil fuel and the bio-plastic. Preferably usable as the bio-plastic are, for instance, bio-polyethylene and bio-polypropylene.
  • a known additive such as a stabilizer, an antioxidant, a lubricant, an antistatic agent, or a colorant may be added as necessary.
  • a user grasps and pulls the tearing strip 120 from a tab 150 provided at a position close to one of the side portions, i.e., the side portion 101 A, of the bag-shaped container 100 .
  • a cut 121 that passes through the first film 111 and the tearing strip 120 may be provided at a position close to the side portion 101 B, of the bag-shaped container 100 , on an opposite side to the tab 150 .
  • the cut 121 makes it easier to form an end of the tearing; however, the end of the tearing is formed without the cut 121 when the film 110 is easily tearable, for instance, and the cut 121 is thus not necessarily provided.
  • an inside of the container body is accessible through a space between the first base 141 and the second base 142 of the zipper portion 140 .
  • engaging the engagement portions 143 A and 143 B with each other makes it possible to reseal the container body, and disengaging the engagement makes it possible to re-unseal the container body.
  • the tab 150 and the surrounding seal portion 160 are provided for an operation of forming the opening in the container body with use of the tearing strip 120 , as described above.
  • the tab 150 is defined by a cut 151 that passes through the first film 111 , the tearing strip 120 , and the belt-shaped base 130 at a position close to one of the side portions, i.e., the side portion 101 A, of the bag-shaped container 100 .
  • the cut 151 has a planar shape of a pot.
  • the cut 151 is not particularly limited in planar shape, and the planar shape of the cut 151 in another embodiment may be, for instance, a C shape, a U shape, or a horseshoe shape.
  • the surrounding seal portion 160 which is a bonding region that surrounds the tab 150 , includes an intersection 161 that traverses the tearing strip 120 and the belt-shaped base 130 .
  • the first film 111 , the tearing strip 120 , the belt-shaped base 130 , and the second film 112 are bonded to each other in the surrounding seal portion 160 by, for instance, heat sealing or ultrasonic sealing.
  • the tab 150 is provided in a non-bonded region adjacent to the surrounding seal portion 160 , that is, in a region where the belt-shaped base 130 and the second film 112 are not bonded to each other. It is to be noted that the surrounding seal portion 160 only has to surround the tab 150 at least partially, and does not necessarily have to enclose an entire circumference of the tab 150 .
  • the surrounding seal portion 160 has a U-shaped planar shape with both end portions in contact with the side portion 101 A of the bag-shaped container 100 where the film 110 is folded back, thus surrounding three sides of the tab 150 except for the side portion 101 A.
  • the surrounding seal portion 160 may surround the tab 150 with the top seal portion 102 or the side seal portion. When the top seal portion is provided afterward, the entire circumference of the tab 150 may not be surrounded at the time when the bag-shaped container is provided.
  • the cut 151 that defines the tab 150 only has to pass through at least the first film 111 and the tearing strip 120 , and may not have to pass through the belt-shaped base 130 , for instance, due to processing errors. Even when the user grasps only the first film 111 and the tearing strip 120 at the tab 150 , the interfacial peeling between the tearing strip 120 and the belt-shaped base 130 occurs, and unsealing is thus possible. Further, the cut 151 may partially pass through the second film 112 , for instance, due to processing errors, as long as the passing through is to an extent that the user does not grasp the second film 112 together with the tearing strip 120 at the tab 150 . As described above, the surrounding seal portion 160 separates the space in which the tab 150 is provided from the other space inside the container body. Thus, the sealing performance of the container body is not affected even the cut 151 partially passes through the second film 112 .
  • the intersection 161 of the surrounding seal portion 160 forms the bonding region that traverses the tearing strip 120 and the belt-shaped base 130 , and an edge, of the bonding region, on a side of the tab 150 in the intersection 161 has a shape that is at least partially not orthogonal to a longitudinal direction of the tearing strip 120 . This makes it possible to smoothly separate the tearing strip 120 and the belt-shaped base 130 from each other when forming the opening portion in the container body with use of the tearing strip 120 .
  • the belt-shaped base 130 is pulled along with the tearing strip 120 and the first film 111 while being torn at a part on an extension of the cut 151 in the longitudinal direction.
  • resistance to the pulling of the tearing strip 120 is relatively high due to tearing of the belt-shaped base 130 .
  • the belt-shaped base 130 is broken in the intersection 161 as illustrated in FIG. 4 B , which makes it possible to pull the tearing strip 120 separated from the belt-shaped base 130 with relatively low resistance to tear the first film 111 , and to form the opening in the container body.
  • the first film 111 , the tearing strip 120 , the belt-shaped base 130 , and the second film 112 are bonded to each other in the intersection 161 . Accordingly, when the pulling of the tearing strip 120 reaches the intersection 161 as illustrated in FIG. 4 B , force acts for separating the first film 111 , the tearing strip 120 , and the belt-shaped base 130 that are being pulled from the second film 112 that is not being pulled.
  • the second film 112 and the belt-shaped base 130 are bonded to each other at a normal bonding strength, whereas the tearing strip 120 and the belt-shaped base 130 include the combination of resins having low compatibility with each other as described above and are thus bonded to each other at a relatively low bonding strength. Therefore, in the intersection 161 , the belt-shaped base 130 and the second film 112 are not separated from each other by the above-described force, and instead, the interfacial peeling occurs between the tearing strip 120 and the belt-shaped base 130 . As a result, breaking occurs in the intersection 161 between a portion of the belt-shaped base 130 that has been pulled together with the tearing strip 120 so far, and the other portion of the belt-shaped base 130 bonded to a side of the second film 112 .
  • FIG. 5 is an enlarged view of the surrounding seal portion of the bag-shaped container illustrated in FIG. 1 .
  • the protrusion 162 is provided on the edge, of the bonding region, on the side of the tab 150 .
  • the protrusion 162 is a part in which the edge of the bonding region protrudes toward the tab 150 . It is to be noted that the protrusion 162 may protrude from the edge of the bonding region in a case where the protrusion 162 is not provided as in the illustrated example, or the protrusion 162 may protrude from a bottom of a concave portion that is provided in the edge of the bonding region.
  • the protrusion 162 may not necessarily protrude relative to the edge of the bonding region of the case where the protrusion 162 is not provided. Further, although multiple protrusions 162 in the illustrated example have a successive saw blade shape, the protrusions 162 may be discretely provided. It is only necessary that at least one protrusion 162 be provided in such a manner as to overlap with the tearing strip 120 , and it is more preferable that multiple protrusions 162 be provided in such a manner as to overlap with the tearing strip 120 .
  • the protrusion 162 makes it easier to break the belt-shaped base 130 in the intersection 161 when the tearing strip 120 is pulled to form the opening in the container body. More specifically, when the tearing strip 120 is pulled from the side of the tab 150 , the force acts for separating the first film 111 , the tearing strip 120 , and the belt-shaped base 130 that are being pulled from the second film 112 that is not being pulled in the intersection 161 , in a concentrated manner on a tip end of the protrusion 162 prior to the other part.
  • Concentrating the force on the tip end of the protrusion 162 makes it possible to: break the belt-shaped base 130 with small force as compared with a case where, for instance, the edge of the bonding region has a straight line that is orthogonal to the longitudinal direction of the tearing strip 120 and force is thus distributed; and separate the tearing strip 120 and the belt-shaped base 130 from each other as illustrated in FIG. 4 B .
  • a maximum value of an unsealing strength of the bag-shaped container of the present exemplary embodiment is reduced as compared with a case where the opening is formed in the bag-shaped container provided with no protrusion in the bonding region.
  • the unsealing strength corresponds to force necessary for forming the opening in the container body by pulling the tearing strip.
  • the unsealing strength of the bag-shaped container according to the present exemplary embodiment is preferably less than or equal to 95%, more preferably less than or equal to 90%, still more preferably less than or equal to 80%, and particularly preferably less than or equal to 70%.
  • a width W of the protrusion 162 i.e., a dimension in a width direction of the tearing strip 120 of the individual protrusion 162 , is preferably less than or equal to 100%, more preferably less than or equal to 80%, still more preferably less than or equal to 60%, and particularly preferably less than or equal to 45% of a width of the tearing strip 120 .
  • the width W of the protrusion 162 is preferably less than or equal to 3 mm, more preferably less than or equal to 2 mm, and still more preferably less than or equal to 1.3 mm.
  • the width W of the protrusion 162 is preferably greater than or equal to 0.3 mm, more preferably greater than or equal to 0.5 mm, and still more preferably greater than or equal to 0.7 mm.
  • the width W is preferably greater than or equal to 5%, more preferably greater than or equal to 10%, and still more preferably greater than or equal to 25% of the width of the tearing strip 120 .
  • a protrusion height H of the protrusion 162 i.e., a height of the individual protrusion 162 in a planar shape protruding from concave portions on both sides thereof or from a linear part, is preferably greater than or equal to 0.3 mm, more preferably greater than or equal to 0.5 mm, and still more preferably greater than or equal to 0.7 mm.
  • the protrusion height H of the protrusion 162 is preferably less than or equal to 5 mm, more preferably less than or equal to 2 mm, and still more preferably less than or equal to 1.5 mm.
  • a width R of a range over which the multiple protrusions 162 are provided is preferably greater than or equal to the width of the tearing strip 120 .
  • a chevron-shaped protrusion as illustrated in the figure may thus be not provided.
  • a protrusion having a trapezoidal shape, a rectangular shape, an arc shape, or the like may be provided.
  • a part having any other shape than the protrusion result in similar effects, because as long as the edge, of the bonding region that overlaps with the tearing strip 120 , on the side of the tab 150 is at least partially not orthogonal to the longitudinal direction of the tearing strip 120 , the part where the force acts in a concentrated manner prior to the other part upon pulling the tearing strip 120 is present.
  • the edge, of the bonding region that overlaps with the tearing strip 120 , on the side of the tab 150 may have a shape that includes at least one concave portion or an oblique corner formed obliquely with respect to the longitudinal direction of the tab 150 .
  • the effects of the intersection 161 and the protrusion 162 as described above are exhibited independently of the fact that the surrounding seal portion 160 surrounds the tab 150 . Accordingly, in another exemplary embodiment of the invention, the bonding region that is formed traversing the tearing strip and the belt-shaped base may not necessarily be the surrounding seal portion that surrounds the tab.
  • FIG. 6 illustrates a process of manufacturing the bag-shaped container according to the first exemplary embodiment of the invention.
  • FIG. 7 is an enlarged cross-sectional view of a portion of the manufacturing process illustrated in FIG. 6 .
  • a manufacturing device 600 includes an elongated-member bonding unit 610 , a tab forming unit 620 , a cut forming unit 630 , a back-seal forming unit 640 , and a top/bottom-seal forming unit 650 .
  • the cut forming unit 630 is omitted when the above-described cut 121 is not provided in the bag-shaped container.
  • the film 110 drawn out from, for instance, an unillustrated roll is processed in the above-described units while being intermittently conveyed. In the following, further description is given of those units.
  • the elongated-member bonding unit 610 bonds an elongated member including the tearing strip 120 , the belt-shaped base 130 , and the zipper portion 140 along a width direction of the film 110 conveyed in a longitudinal direction.
  • the tearing strip 120 , the belt-shaped base 130 , and the zipper portion 140 may be molded as an integrated elongated member by extrusion (including co-extrusion), for instance.
  • the tearing strip 120 may be molded separately from the belt-shaped base 130 and the zipper portion 140 , and the tearing strip 120 , and the belt-shaped base 130 and the zipper portion 140 may be bonded to the film 110 by respective bonding methods different from each other.
  • the elongated member is bonded to a part that is to be the first film 111 after a process of folding back to be described later.
  • the elongated-member bonding unit 610 includes a feeder 611 and seal bars 612 A and 612 B.
  • the feeder 611 sends the elongated member having a predetermined length and disposes the elongated member at a predetermined position on the film 110 .
  • the feeder 611 may include an unillustrated cutter that cuts the elongated member to have the predetermined length.
  • the seal bars 612 A and 612 B sandwich therebetween the film 110 together with the elongated member disposed thereon, and bond the elongated member to the film 110 by, for instance, heat sealing or ultrasonic sealing.
  • an adhesive may be applied in advance between the elongated member and the film 110 , and the seal bars 612 A and 612 B may sandwich and press the film 110 and the elongated member that are stacked on each other to thereby bond the film 110 and the elongated member to each other.
  • the tab forming unit 620 forms a tab defined by the cut 151 that passes through the film 110 and the elongated member bonded to the film 110 .
  • the tab forming unit 620 includes a cutter 621 and a receiver base 622 .
  • the cutter 621 has a planar shape corresponding to the cut 151 .
  • the elongated member is bonded to the part to be the first film 111 , but the film 110 has not yet been folded back at this stage.
  • the cut 151 that passes through the film 110 and the elongated member thus will not pass through the second film 112 of the completed bag-shaped container 100 .
  • the cut forming unit 630 forms the cut 121 in the film 110 and the elongated member bonded to the film 110 .
  • the cut forming unit 630 includes a cutter 631 and a receiver base 632 .
  • the cut 121 passes through the film 110 and the tearing strip 120 and does not pass through the belt-shaped base 130 .
  • a cut depth of the cutter 631 is thus adjusted to a value corresponding to a total thickness of the film 110 and the tearing strip 120 .
  • a region including the cut 121 may be pressed after the cut 121 is formed to thereby improve the sealing performance of the container body in the vicinity of the cut 121 .
  • the back seal forming unit 640 rolls the film 110 into a tube in such a manner that the both sides in the width direction of the film 110 meet each other, and forms the back seal portion 104 .
  • the back seal forming unit 640 thus forms a general shape of the container body including the first film 111 and the second film 112 .
  • the back seal forming unit 640 includes a roll core 641 , a conveyor belt 642 , and a sealer 643 .
  • the film 110 is conveyed downward by the conveyor belt 642 while being rolled around the roll core 641 .
  • the film 110 rolled into the tube is folded back on both sides in the width direction corresponding to the side portions 101 A and 101 B of the bag-shaped container 100 .
  • the first film 111 and the second film 112 as described above are thereby formed.
  • the sealer 643 bonds both end portions in the width direction of the rolled film 110 to each other by, for instance, heat sealing or ultrasonic sealing, to thereby form the back seal portion 104 .
  • the top/bottom seal forming unit 650 forms the top seal portion 102 and the bottom seal portion 103 in the film 110 that has been on folded back on the both sides in the width direction, and cuts the film 110 in the width direction to thereby form the film 110 into the bag-shaped container 100 .
  • the top/bottom seal forming unit 650 forms the above-described surrounding seal portion 160 .
  • the top/bottom seal forming unit 650 includes seal bars 651 A and 651 B, a cutter 652 , a receiver base 653 , and sealers 654 A and 654 B.
  • the sealers 654 A and 654 B form the surrounding seal portion 160 .
  • the seal bars 651 A and 651 B each have an upper part and a lower part with the cutter 652 interposed therebetween.
  • the respective upper parts of the seal bars 651 A and 651 B are opposed to each other, and the respective lower parts of the seal bars 651 A and 651 B are opposed to each other.
  • the opposed portion of the upper parts and the opposed portion of the lower parts become the top seal portion 102 and the bottom seal portion 103 by, for instance, heat sealing or ultrasonic sealing.
  • the cutter 652 and the receiver base 653 move together with the seal bars 651 A and 651 B to thereby move toward and away from each other, and cut the film 110 in the width direction between the top seal portion 102 and the bottom seal portion 103 that are formed by the seal bars 651 A and 651 B.
  • the roll core 641 of the back seal forming unit 640 is hollow, and a filling device 601 is inserted from above into an inside of the roll core 641 .
  • the filling device 601 discharges contents in synchronization with the seal bars 651 A and 651 B sandwiching the film 110 in the top/bottom seal forming unit 650 .
  • a space provided above the bottom seal portion 103 of the bag-shaped container 100 is filled with the contents.
  • the seal bars 651 A and 651 B have moved away from each other, the contents are conveyed downward together with the film 110 beyond the seal bars 651 A and 651 B, following which the top seal portion 102 is formed to thereby seal the bag-shaped container 100 .
  • the sealers 654 A and 654 B sandwich the film 110 in synchronization with the seal bars 651 A and 651 B and form the surrounding seal portion 160 by, for instance heat sealing or ultrasonic sealing.
  • Seal bars of the sealers 654 A and 654 B each have a planar shape corresponding to the surrounding seal portion 160 as illustrated in FIG. 5 , for instance.
  • the seal bar has a U-shaped planar shape surrounding three sides of a predetermined region in which the tab is defined by the cut 151 , and the inner edge of at least one side of the planar shape includes at least one protrusion.
  • the seal bar may have a shape that is not the U shape if a part off the film 110 is included, for instance, a substantially rectangular planar shape enclosing four sides of the above-described predetermined region.
  • the bag-shaped container 100 is manufacturable by the above-described process. It is to be noted that the above-described process is merely an example, and various modifications are possible. For instance, the tab forming unit 620 and the cut forming unit 630 may be disposed in reverse order from the above-described example. Alternatively, the tab forming unit 620 and the cut forming unit 630 may be integrated to form the cut 151 and the cut 121 substantially simultaneously.
  • the seal bars 651 A and 651 B that are included in the top/bottom seal forming unit 650 may be separated from the cutter 652 and receiver base 653 that are also included in the top/bottom seal forming unit 650 , thereby cutting the film 110 in the width direction after the top seal portion 102 and the bottom seal portion 103 are formed.
  • the sealers 654 A and 654 B may form the surrounding seal portion 160 before the seal bars 651 A and 651 B form the top seal portion 102 and the bottom seal portion 103 .
  • the sealers 654 A and 654 B are disposed above the seal bars 651 A and 651 B, and the surrounding seal portion 160 is formed before the bottom seal portion 103 located at a bottom of the bag-shaped container 100 is formed. This makes it possible to prevent the contents to be filled in synchronization with the forming of the bottom seal portion 103 from adhering to a region on an inner side of the surrounding seal portion 160 .
  • the bag-shaped container 100 is not necessarily manufactured while being filled with the contents.
  • the above-described manufacturing device 600 may omit the filling device 601 , and may thereby manufacture the bag-shaped container 100 that is not filled with the contents.
  • the tab forming unit 620 may be disposed in a subsequent stage of the sealers 654 A and 654 B that form the surrounding seal portion 160 .
  • the cutter 621 is disposed on the side of the first film 111 and the receiver base 622 is disposed on the side of the second film 112 .
  • the cut 151 that defines the tab does not completely pass through the second film 112 .
  • a cut depth of the cutter 621 is thus adjusted to a value corresponding to a total thickness of the first film 111 , the tearing strip 120 , and the belt-shaped base 130 . Forming the cut 151 after the surrounding seal portion 160 makes it possible to minimize deformation of the cut due to thermal shrinkage of the film caused by heat sealing or ultrasonic sealing, for instance.
  • bag-shaped containers according to other exemplary embodiments to be described below are manufacturable by combining the process of manufacturing the bag-shaped container 100 according to the first exemplary embodiment as described above with a process of manufacturing another known bag-shaped container, or by replacing a portion of the process of manufacturing the bag-shaped container 100 with a process of manufacturing another bag-shaped container. Accordingly, in the following description of other exemplary embodiments, description of manufacturing processes will be omitted.
  • FIG. 8 is a plan view of a bag-shaped container according to a second exemplary embodiment of the invention.
  • FIG. 9 is an enlarged view of a surrounding seal portion of the bag-shaped container illustrated in FIG. 8 .
  • the back seal portion is not provided in a bag-shaped container 200 , and instead, a side seal portion 205 is provided in the side portion 101 A.
  • the surrounding seal portion 160 together with the side seal portion 205 form a bonding region that encloses four sides of the tab 150 .
  • the seal bar that forms the surrounding seal portion 160 includes a substantially rectangular planar shape enclosing four sides of a predetermined region in which the tab is defined by the cut 151 , and the inner edge on at least one side of the planar shape includes at least one protrusion.
  • the seal bar is integrally formed with a seal bar that forms the side seal portion 205 .
  • FIG. 10 is a plan view of a bag-shaped container according to a third exemplary embodiment of the invention.
  • FIG. 11 is a cross-sectional view taken along a line XI-XI of the bag-shaped container illustrated in FIG. 10 .
  • a bag-shaped container 300 is what is called a gusset bag, and portions 311 A and 311 B are respectively provided in the side portions 101 A and 101 B of the bag-shaped container 300 . In each of the portions 311 A and 311 B, the film 110 is folded into the inside of the container body. Accordingly, as illustrated in FIG.
  • the surrounding seal portion 160 bonds the first film 111 , the tearing strip 120 , the belt-shaped base 130 , and a film included in the portion 311 A folded inside with each other. That is, in the surrounding seal portion 160 according to the present exemplary embodiment, the film included in the portion 311 A folded inside corresponds to the second film 112 according to the first exemplary embodiment.
  • a portion 312 is provided at a bottom of the bag-shaped container 300 . In the portion 312 , a film different from the film 110 is folded into the inside of the container body.
  • a configuration of the gusset bag is not limited to the above-described example, and various known techniques are available.
  • the part of the side portion folded inside may include a film different from the film 110 .
  • the side seal portion may be provided instead of the back seal.
  • Configurations of the present exemplary embodiment other than those described above are similar to those of the above-described first exemplary embodiment, and thus redundant description thereof is omitted.
  • the modifications described for the first exemplary embodiment is similarly applicable in the present exemplary embodiment.
  • FIG. 12 is a cross-sectional view of a bag-shaped container according to a fourth exemplary embodiment of the invention.
  • FIG. 12 is the cross-sectional view of a part taken along a line III-III indicated in FIG. 1 .
  • a bag-shaped container 400 includes no zipper portion.
  • a cross section of a belt-shaped base 430 includes a concave portion 432 , and convex portions 431 and 433 on both sides of the concave portion 432 .
  • the tearing strip 120 is disposed on the concave portion 432 .
  • the concave portion 432 has a slit 434 .
  • the tearing strip 120 undergoes the interfacial peeling from the belt-shaped base 430 and tears the first film 111 to form the opening portion in the container body. Thereafter, the inside of the container body is accessible via the slit 434 .
  • the first film 111 , the tearing strip 120 , the concave portion 432 of the belt-shaped base 430 , and the second film 112 are bonded to each other in the surrounding seal portion 160 .
  • the present exemplary embodiment is thus similar to the first exemplary embodiment in that it is possible to smoothly separate the tearing strip 120 and the belt-shaped base 430 from each other, by causing the edge on the side of the tab 150 at the intersection of the surrounding seal portion 160 with the tearing strip 120 to have a shape that is at least partially not orthogonal to the longitudinal direction of the tearing strip 120 .
  • Configurations of the present exemplary embodiment other than those described above are similar to those of the above-described first exemplary embodiment, and thus redundant description thereof is omitted.
  • the modifications described for the first exemplary embodiment is similarly applicable in the present exemplary embodiment.
  • the configuration in such a case is not limited to the example of the fourth exemplary embodiment, and may be, for instance, a configuration in which the zipper portion 140 is excluded from the configuration of the first exemplary embodiment as illustrated in the cross-sectional view of FIG. 3 , for instance.
  • FIG. 13 is a plan view of a bag-shaped container according to a fifth exemplary embodiment of the invention.
  • FIG. 14 is a cross-sectional view taken along a line XIV-XIV of the bag-shaped container illustrated in FIG. 13 .
  • a bag-shaped container 500 includes the film 110 , the tearing strip 120 , the belt-shaped base 130 , the zipper portion 140 , and a protector 170 .
  • the tab 150 is provided at a position close to one of the side portions, i.e., the side portion 101 A, of the bag-shaped container 100 .
  • the tab 150 is provided near one end portion in the longitudinal direction of the elongated member including the tearing strip 120 , the belt-shaped base 130 , and the zipper portion 140 .
  • the protector 170 bonded to a region covering the tab 150 is also included in the elongated member.
  • the protector 170 is bonded, on a side of the belt-shaped base 130 , to the region covering the tab 150 defined by the cut 151 .
  • the cut 151 passes through the first film 111 , the tearing strip 120 , and the belt-shaped base 130 .
  • the protector 170 may at least partially extend beyond the belt-shaped base 130 and may also be bonded to the first film 111 .
  • the protector 170 seals a space leading to the cut of the tab 150 on an inner side of the container body, making it possible to improve sealability of the bag-shaped container 500 before being unsealed with use of the tearing strip 120 .
  • the material of the protector 170 is, for instance, similar to that of the film 110 described above. Among the above-described materials, different materials may be selected for the protector 170 and the film 110 , but it is more preferable to select the same material for the protector 170 and the film 110 .
  • the bag-shaped container 500 may have a protector 172 disposed in such a manner as to cover, on the inner side of the container body, a region in which the cut 121 is provided on the opposite side to the tab 150 .
  • a protector 172 disposed in such a manner as to cover, on the inner side of the container body, a region in which the cut 121 is provided on the opposite side to the tab 150 .
  • the cut 121 may be provided in such a manner as to pass through the first film 111 and the tearing strip 120 but does not pass through the belt-shaped base 130 . In this case, the space leading to the cut 121 does not reach the inner side of the container body.
  • the protector 172 may thus not be disposed. Further, as described in the first exemplary embodiment, the cut 121 may not necessarily be provided.
  • the protector 170 is bonded to the belt-shaped base 130 in a surrounding seal portion 560 .
  • the surrounding seal portion 560 is a bonding region that surrounds the tab 150 and includes an intersection that traverses the tearing strip 120 and the belt-shaped base 130 , as with the surrounding seal portion described above in the first exemplary embodiment.
  • the first film 111 , the tearing strip 120 , the belt-shaped base 130 , and the protector 170 are bonded to each other in the surrounding seal portion 560 by, for instance, heat sealing or ultrasonic sealing.
  • the tab 150 is provided in a non-bonded region adjacent to the surrounding seal portion 560 , that is, in a region where the belt-shaped base 130 and the protector 170 are not bonded to each other.
  • an edge, of the surrounding seal portion 560 , on a side of the tab 150 has a shape that is at least partially not orthogonal to the longitudinal direction of the tearing strip 120 .
  • the intersection of the surrounding seal portion 560 is configured similarly to that in the example described with reference to FIG. 5 for the first exemplary embodiment, for instance. This makes it possible to smoothly separate the tearing strip 120 and the belt-shaped base 130 from each other when forming the opening portion in the container body with use of the tearing strip 120 .
  • FIG. 15 illustrates an exemplary configuration of a film assembly according to the fifth exemplary embodiment of the invention.
  • a film assembly 550 according to the present exemplary embodiment includes the film 110 before being folded back on the side portions 101 A and 101 B, and at least two elongated members that are attached to one surface of the film 110 and are separated from each other along a longitudinal direction of the film 110 wound in a roll.
  • the elongated member includes the tearing strip 120 , the belt-shaped base 130 , the zipper portion 140 , and the protector 170 .
  • the tab is defined by the cut 151 .
  • the surrounding seal portion 560 see FIG.
  • a width L 1 of the film is greater than twice a length L 2 of the elongated member in order to form the container body by being folded back as described above.
  • FIG. 16 illustrates a process of manufacturing a bag-shaped container using the film assembly illustrated in FIG. 15 .
  • the film assembly 550 unrolled from the roll has the elongated member including the tearing strip 120 , the belt-shaped base 130 , the zipper portion 140 , and the protector 170 attached thereto.
  • the film assembly 550 is formed into a bag-shaped container by the back-seal forming unit 640 and the top/bottom-seal forming unit 650 in a manner similar to the example illustrated in FIG. 6 .
  • the surrounding seal portion 560 is already provided on the film assembly 550 as described above.
  • the top/bottom-seal forming unit 650 may not include the sealer for forming the surrounding seal portion.
  • the process of manufacturing the bag-shaped container according to the present exemplary embodiment is not limited to such an example.
  • the process of attaching the elongated member to the film 110 upon manufacturing the bag-shaped container may be performed.
  • a process of bonding the protector 170 to the elongated member in the surrounding seal portion 560 is performed.
  • Example 1 the protrusion was provided at the edge on the side of the tab at the intersection of the surrounding seal portion with the tearing strip as described above as the exemplary embodiments.
  • Comparative Example 1 the edge, of the intersection, on the side of the tab had a straight line and no protrusion was provided.
  • a maximum value of a tensile strength during a period from when the tab was grasped and the pulling of the tab was started until the tearing of the film with use of the tearing strip passed the intersection of the surrounding seal portion i.e., a maximum value of a tensile strength upon unsealing
  • Example 1 the tensile strength was measured at a tensile rate of 300 mm/min using a “digital force gauge” available from Imada Corporation.
  • the tearing strip included the polypropylene random copolymer and the belt-shaped base included low-density polyethylene.
  • Table 1 The results of Example and Comparative Example shown in Table 1 revealed that providing the protrusion on the edge of the bonding region greatly reduced the maximum value of the tensile strength upon unsealing.

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US18/580,307 2021-07-20 2022-07-14 Container, method for manufacturing container, device for manufacturing container, seal bar, and film assembly Pending US20240327091A1 (en)

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PCT/JP2022/027770 WO2023002925A1 (ja) 2021-07-20 2022-07-14 容器、容器の製造方法、容器の製造装置、シールバーおよびフィルム組立体

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JPS6013661A (ja) * 1983-06-24 1985-01-24 株式会社平野屋物産 合成樹脂袋のノツチ部構造
JP3410142B2 (ja) * 1993-03-30 2003-05-26 株式会社平野屋物産 開封容易とした自立可能な合成樹脂製袋
JP2005263300A (ja) * 2004-03-19 2005-09-29 Idemitsu Unitech Co Ltd ファスナー付き包装袋、その製造方法、並びにファスナー取付装置
US7887653B2 (en) * 2005-04-18 2011-02-15 Idemitsu Unitech Co. Ltd. Device and method for manufacturing bag with chuck tape
JP4874742B2 (ja) * 2006-08-21 2012-02-15 出光ユニテック株式会社 カットテープ付きチャックテープ、その製造方法、およびチャックテープ付き包装袋
JP6314444B2 (ja) * 2013-11-26 2018-04-25 凸版印刷株式会社 背貼り包装袋
CN108024600B (zh) * 2015-09-14 2023-12-01 出光统一科技株式会社 带有卡扣带的袋体、袋体、袋体的制造方法及袋体的制造装置
JP6894753B2 (ja) * 2017-05-08 2021-06-30 出光ユニテック株式会社 袋体、フィルム体、及び袋体の製造方法
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EP4375212A1 (en) 2024-05-29
EP4375212A4 (en) 2025-09-24

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